Yunnan Rainbow Bio-tech. Co is the biggest transporting company of water soluble natural colors and one of the main transporting businesses of marigold and paprika oleoresins. They also offer Vegetable Juice Concentrates, 20-Hydroxyecdysone, Xanthophylls and Tannic Acid. They are constantly improving their technology and own several patents on special technologies, for example, Ultasonic Extraction and Molecular Distillation.